First, thanks for the useful module!
During migrations, it would be great to have access to check for duplicates, and this module is a great way to do it.
Add a new migrate process plugin that checks for filehash existence of files based on a given path.
Review
N.A.
New handy filehash_get_fid plugin.
N.A.
Needs work
3.0
Code
The change is currently missing an automated test that fails when run with the original code, and succeeds when the bug has been fixed.
Not all content is available!
It's likely this issue predates Contrib.social: some issue and comment data are missing.
Move feature request to current dev branch
Here's a 3.x version of the patch using the file_managed table instead.